Electrical fuse.



PATENTED JUNE 2, 1908.

A. G. CHARTERS & J. G. JONES. ELECTRICAL FUSE.

: APPLIOA'I'ION FILED JUNE 21,1907.

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Specification of Letters Patent.

'. Application filed June 21, 1907. Serial No. 380,104.

To all whom it may concern:

Be it known thatwe, ALBERT GEORGE CHARTERS and JOHN GRIFFITH JONES, subjects of the King of Great Britain and Irewhich land, residing at Cardiff Road, Watford, in the county of Hertfordshire, England, and at Garthroyd, Lower Whi pendell Road, Watford, in the county 0 Hertfordshire, En land, have invented certain new and use 1 Improvements in Electrical Fuses, of which the following is a specification. w

This vention relates .to an improved electrical fuse which automatically remakes the circuit on a wire fusing and can be repaired without interfering with the circuit.

The fuse is provided with several I fuse wires tween spring contact with the terminals. The insulator is controlled by a spring and on a wire fusing the contacts are withdrawn by their springs from the torminals'and the insulating body turns to bring the terminals so "that the circuit is instantly remade. Successive wires are brought into the circuit in the same manner and the fuse can at an time. be repaired without breaking the clrcuit.

11 order that our invention may be more readily understood, reference is'had to the accompanying sheet of the drawings in Figure 1 is a vertical section of an automatic fuse according to our invention; Fig. 2 is a plan; and Figs. 3 land 4 are detail views. A is the insulating bod of the fuse, usually of porcelain,-and it is m unted free to turn in the brackets B and B from which it can readily be removed. The lower end rests in a recess b in the bottom bracket while the u per reduced and (1 turns in the end of a s t b in the to bracket and is held in the pivoted at c and secured by aset screw c. I The bottom bracket B is slotted obliquely at b, and through this slot is-passed the late d holding'the end of the sprin D to w 'ch it is attached by the small pin. This spring is placed in the recess a of the insulator A and is secured to the insulator at its upper end. The plate d bears against the stops 6 on the bracket B and serves to put the s ring D tension. The spring is wound up y pulling down the plate (1 and turning it as far as required. On

release the plate is held by the stops b' and mounted on a revolving insulator be tension dev1ces'serv1ng to make:

next pair of contacts car rying another wire into contact with the attachment, so that the each" end of the insulator,

the'spring therefore tends to turn the insulator. If the fu insulator can be purposes and while the fuse wires are being Inserted the insulator is held from tulhing in the bottom bracket. The fuse can be readily by the stop I) removed from the brack plate (1 so that it passes ets by turning the when the top of, the insuthrough the slot b Patented June 2,1908.

se wires are not inserted the turned directly for winding withdrawnfrom the slotinthe up er bracketr I The insulator is fprovided in t e arrange o ment shown with ur arms E at both top and bottom and these arms are recessed at e to receive the contact and tension device's consisting of a stem E (of triangular or square form in section), the disk and the contact head f On this stem is t e s ring G which when released draws the steminto the recess as shown at the left The fuse wire-H is attached to the top bottom contact heads f 1 by'the screws f the heads being drawn towards each other for wire hold them in place read to make contact with t terminals in the manner shown where one of the contact pieces f is just hand side of Fig.1. a

and

he s ring in 4,

about to enter between the two arms of the terminal. i

The action of the'apparatus is as follows:

On the destruction ofa fuse wireH the ten j sion and contact devices are released and the springs G draw the corres heads f out of the termina s. a The insulating support is thus released and turns under the force of the sprin D until the next con.'

tacts, already unite by a' fuse wire, are brought. into the terminals, when the circuit is again completed. This movement is reeated, at each fusing of the wire untilthe use wires are exhausted, butthese may of course be replaced while the fuse is in use so that interruption of the circuit is unnecessar is applied to fuses of theoil break type the general arrangement is the same but t e onding contact" fuse is placed horizontally in the oil bath and n the details are arranged accordingly. 3 What we claim as our invention and desire to secure by Letters Patent is 1. In an automatically replaceable fuse,

the combination of a rotating insulator, a support, a controlling spring for the insulator, spring controlled] contact pieces at fuse wires uniting the contact pieces and terminals receiving ios at i 'lator, after the plate is turned back can be f i the contact pieces, which when a wire breaks i a are withdrawn automatically from the terminals to permit the insulator to turn.

- ,2. In an automatically replaceable fuse, a spring controlled rotatin insulator, recessed arms at both ends 0 the said insulator, contact pieces mounted in the said arms, s rings in the recesses tending to withdraw t e said contact' pieces and fuse wires connecting the contact pieces and. drawing them out against the force of the springs.

3. In an electrical fuse, a rotatin insulator, brackets receiving the ends of t e said insulator, a sprin mounted within the insulator and attache to it a slot in one bracket,

a bar connected to the end of the spring and ads ted to'pass through the slot, stops on the racket to retain the bar and spring controlled contacts on the insulator united by fuse wires, substantially as herein described;

4. In an electrical fuse, the combination of a rotating insulator A, brackets B and B supporting it, a slot 6 in one bracket receiving one end of the insulator, a pivoted late C securing the end of the insulator, an ob ique slot 1) in the second bracket, a spring D in the recess a of the-insulator, a plate d attached to the spring, stops b against which the plate rests, recessed arms E on the insulator, s ring controlled contact pieces mounted in t e arms and fuse wires-connecting the contact pieces and holding them against the force of their springs, substantially as herein described.

In witness whereof we have hereunto set our hands in thepresence of two witnesses.

ALBERT G. CHARTERS. JOHN GRIFFITH JONES.

Witnesses:

FRANK W. PATTISON, GERTRUDE M. BAXTER. 

